如何在同一页面上为多个图表设置单个xlabel和ylabel

I am using the code given below to plot multiple graphs on the same page using ggplot. Instead of each graph having its own xlabel, ylabel, title and legend description, I want just one such for each page. I tried to find a solution to that, but to no avail. Can someone please let me know, or point me to a relevant thread? Thanks.I am using the code given below to plot multipl